1391481 has 24 divisors (see below), whose sum is σ = 2475200. Its totient is φ = 733536.

The previous prime is 1391479. The next prime is 1391483. The reversal of 1391481 is 1841931.

It is an interprime number because it is at equal distance from previous prime (1391479) and next prime (1391483).

It is not a de Polignac number, because 1391481 - 2¹ = 1391479 is a prime.

It is a super-2 number, since 2×1391481² = 3872438746722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1391483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31 + ... + 1668.

2^1391481 is an apocalyptic number.

It is an amenable number.

1391481 is a deficient number, since it is larger than the sum of its proper divisors (1083719).

1391481 is a wasteful number, since it uses less digits than its factorization.

1391481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 1722 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 1391481 is about 1179.6105289459. The cubic root of 1391481 is about 111.6415249950.

The spelling of 1391481 in words is "one million, three hundred ninety-one thousand, four hundred eighty-one".